Centrifugal-pump lining.



PATENTED AUG. 15, 1905.

P. J. HEDLUND. GENTRIFUGAL PUMP LINING.

APPLIOATION FILED JAN. 12. 1905.

WITNESSES:

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PER J OHAN HEDLUND, OF STOGKHOLM, SWEDEN.

CENTRIFUGAL-PUMP LINING.

Specification of Letters Patent.

Patented Aug. 15, 1905.

Application filed Ianuary 12, 1905. Serial No. 240,727.

To aZZ whom it may concern:

Be it known that I, PER J OHAN HEDLUND, of Stockholm, Sweden, have invented a new and useful Improvement in Centrifugal-Pump Linings, of which the following is a specification.

- The invention relates to centrifugal pumps; and it consists in a detachable lining interposed between the pump-casing and the wheel 'and also in the combination, with a rotary pump-wheel and a casing therefor construct-' ed to inclose the circumferential periphery of said wheel, of a detachable internal lining having a flange interposed between said casing and said wheel periphery.

The object of the invention is to provide wearing-rings between pump and casing and also to protect the interior of the casing from abrasion due to solids in the liquid pumped.

In the accompanying drawings, Figure 1 is a section of a centrifugal pump on the line was of Fig. 2, showing my lining in place. Fig. 2 is a section on the line y 3 of Fig. 1. Fig. 3 is an edge view, and Fig. 4 is a side View, of the upper half of my lining.

Similar numbers of reference indicate like parts.

The pump-casing is divided internally into two sections 1 and 2, which are secured together by any suitable means. The inlet 3 and the outlet 4 are formed in the lower section 2. The bearings 5 and 6 for the wheelshaft 7are in both sections. The pump-wheel 8, of usual construction, is keyed on the shaft 7 Ordinarily within the casing sections there are formed semicircular flanges 9 and 10, which inclose the pump-wheel and make a joint with the periphery thereof. Between the meeting faces of said flanges and of the wheel periphery there is apt to be much wear, especially if the liquid pumped contains grit or dirt, and this soon results in undesirable leakage. In addition the solid materials in the liquid scour and abrade the interior-0f the casing, so that the latter soon becomes thin and wears out. In order to obviate these difflculties, I provide an interior lining or casing 11, formed in two parts 12 and 13. Each part of said lining conforms to the general shape of the part of the casing in which it is received and forms a complete protection for the internal surface of said casing against the abrasion or wear due to solids in suspension in the liquid pumped. On each part of said lining are shouldered flanges 14, which enter between the casing-flanges 9 and 10 and the pump-wheel periphery, and so serve as wearing-rings to take up the frictional wear due to rotation of the pump-wheel. It will be observed that by this construction practically all the wear comes upon the lining 11, which may be cheaply madeas a casting and easily applied and removed.

I claim 1. In combination with a rotary pun1pwheel and a casing therefor, inclosing the circumferential periphery of said wheel, a lining for said casing having flanges interposed between said casing and said wheel periphcry.

2. In combination with a rotary pumpwheel and a casing therefor divided into an upper and a lower section and inclosing the circumferential periphery of said wheel, a lining for said casing formed in sections, respectively received in said casing-sections, and provided with flanges interposed between said casing and said wheel periphery.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

IER JOHAN HEDLUND.

Witnesses WALDEMAR BoMAN, ERIK FOSSBERG. 

